Improvement in door-springs



f UNITED STATEs- AUSTIN D. HOFFMAN, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF HIS PATENT OEEICE.

RIGHT TO NATHAN FRIEDMAN, OF SAME PLACE.

IMPROVEMENT IN DOOR-SPRINGS.

Specification forming part of Letters Patent N0. 135,9 14H1, dated February 18, 1873.

' ment, and Fig. 2 is a side elevation of the same.

Similar letters 0f reference indicate like parts in both figures of the drawing.

My invention has for its object to provide a device by the use ot' Which a door may be made self-closing; and it consists in a spring, one end of which is permanently attached to the facecasing, and the other end coiled around and attached to a Wheel pivoted upon an angle-bar, Which lis firmly afiixed to the door. The arrangement of the spring is such as to uncoil as the door is opened, and to recoil around the Wheel by its own elasticity, thereby closing the door, all of which will be more fully understood by the following description:

. In the drawing, A represents the face-casing of the door-frame, and A the door, both of which are arranged in the usual manner. B is a metal angle-bar, which is permanently affixed to the door and extends outward at a right angle therefrom. Pivoted upon the outer extremity of this bar is a Wheel, C, which .is so arranged as to freely revolve thereon.

Firmly secured to and coiled around the periphery of this Wheel is a iiat metal spring, D, one end of which is permanently attached to the face-easing, as shown in Fig. 2.

The action ot' this spring is such that as the door is opened the spring is made to uncoil from around the Wheel, and as power is removed from the vdoor the elasticity of the spring causes the same to recoil around the wheel, thereby closing the door.

Having thus described my invention, I

claiml The combinationV of the angle-bar B upon the door, wheel C, and spring D, as described,

the spring secured above the door and actingl to close the same by coiling around the Wheel, substantially as specified. Y

The above specification of my invention signed by me this 4th day ot' December, 1872.

AUSTIN I). HOFFMAN.

Witnesses:

N. H. SHERB'ORNE, A. S. ALEXANDER. 

